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The White House and U.S. Capitol were ordered evacuated for security reasons on Wednesday.

WASHINGTON (CNN) -- An apparent airspace violation over Washington on Wednesday prompted evacuations of the White House and the U.S. Capitol as military fighter jets scrambled to intercept an unidentified aircraft.

An all-clear announcement was issued about 15 minutes after the alert.

"Run, this is no joke, leave the grounds," a U.S. Secret Service agent told CNN White House Correspondent Suzanne Malveaux.

The Federal Aviation Administration confirmed to CNN it had tracked an unidentified aircraft that apparently violated airspace over the White House.

Former CNN anchor Bernard Shaw said he heard two F-16 jets and saw them circle a single-engine airplane and fire warning flares. The jets then seemed to direct the small aircraft away from the downtown Washington area, Shaw said.

Malveaux said a motorcade of six or seven cars left the White House during the evacuation. President Bush was not at the White House at the time. He was on a bike ride with a security detail, officials said.

CNN Congressional Correspondent Joe Johns said members of the Senate were evacuated from the Senate floor while it was in session.

The Secret Service gave the all-clear at the White House minutes after the incident, and allowed journalists to return to the executive mansion.